Bump game-ci/unity-test-runner from 3 to 4

Bumps [game-ci/unity-test-runner](https://github.com/game-ci/unity-test-runner) from 3 to 4.
- [Release notes](https://github.com/game-ci/unity-test-runner/releases)
- [Commits](game-ci/unity-test-runner@v3...v4)

---
updated-dependencies:
- dependency-name: game-ci/unity-test-runner
  dependency-type: direct:production
  update-type: version-update:semver-major
...

Signed-off-by: dependabot[bot] <support@github.com>

.github/workflows/unity-tests.yml

@@ -15,7 +15,7 @@ jobs:
       - name: Checkout repository
         uses: actions/checkout@v4
       - name: Run Unity tests
-        uses: game-ci/unity-test-runner@v3
+        uses: game-ci/unity-test-runner@v4
         env:
           UNITY_LICENSE: ${{ secrets.UNITY_LICENSE }}
         with: